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How Do You Make A Piston Valve?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: someguy314 » Tue Jun 08, 2010 10:41 pm

This is a different question I came across.

Does the piston sit there and move along with the air pressure or does it have a rod through it and move along the rod with the air pressure? Or is it something completely different?
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Unread postAuthor: Technician1002 » Tue Jun 08, 2010 11:29 pm

Most piston valves are operated by air pressure. There is no rod. The one exception is my QDV which can't open by venting the pilot area to zero due to the 1:1 ratio of the seal diameter/piston OD diameter ratio. The rod is used to trigger it instead of air pressure. Once triggered, it is opened by air pressure at high speed.
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Unread postAuthor: Crna Legija » Wed Jun 09, 2010 1:06 am

have you read this
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Unread postAuthor: Technician1002 » Wed Jun 09, 2010 1:20 am

That one is a chamber sealer. The thread need an update to explain the differences between barrel and chamber sealers and how they are different.
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Unread postAuthor: someguy314 » Wed Jun 09, 2010 8:58 am

-_- wrote:have you read this


Yes I have.
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Unread postAuthor: someguy314 » Wed Jun 09, 2010 9:02 am

Technician1002 wrote:Most piston valves are operated by air pressure. There is no rod. The one exception is my QDV which can't open by venting the pilot area to zero due to the 1:1 ratio of the seal diameter/piston OD diameter ratio. The rod is used to trigger it instead of air pressure. Once triggered, it is opened by air pressure at high speed.


Ooh I see ok cool but its kinda weird that it would work like that. But yeah that pretty much answers my question thanks!
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Unread postAuthor: spudtyrrant » Wed Jun 09, 2010 11:58 am

Technician1002 wrote:That one is a chamber sealer. The thread need an update to explain the differences between barrel and chamber sealers and how they are different.
scroll down :wink:
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Unread postAuthor: someguy314 » Wed Jun 09, 2010 12:24 pm

spudtyrrant wrote:
Technician1002 wrote:That one is a chamber sealer. The thread need an update to explain the differences between barrel and chamber sealers and how they are different.
scroll down :wink:


what :?:
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Unread postAuthor: Technician1002 » Wed Jun 09, 2010 12:45 pm

Chamber seal, Barrel Seal, and Coaxial are shown.
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Unread postAuthor: someguy314 » Wed Jun 09, 2010 5:24 pm

Technician1002 wrote:Chamber seal, Barrel Seal, and Coaxial are shown.


oh
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